// R(A) := -R(B), integer
// NOT yet used
void RaviCodeGenerator::emit_UNMI(RaviFunctionDef *def, int A, int B, int pc) {
(void)pc;
emit_load_base(def);
llvm::Value *ra = emit_gep_register(def, A);
llvm::Value *rb = emit_gep_register_or_constant(def, B);
llvm::Instruction *lhs = emit_load_reg_i(def, rb);
llvm::Value *result = def->builder->CreateNeg(lhs, "", false, true);
emit_store_reg_i_withtype(def, result, ra);
}
void RaviCodeGenerator::emit_BITWISE_SHIFT_OP(RaviFunctionDef *def, OpCode op,
int A, int B, int C, int pc) {
bool traced = emit_debug_trace(def, op, pc);
emit_load_base(def);
llvm::Value *ra = emit_gep_register(def, A);
// If the RHS is a constant and we know that LHS is
// and integer then we can optimize the code generation
if (op == OP_RAVI_SHL_II && ISK(C)) {
lua_Integer y = def->p->k[INDEXK(C)].value_.i;
emit_bitwise_shiftl(def, ra, B, y);
} else if (op == OP_RAVI_SHR_II && ISK(C)) {
lua_Integer y = def->p->k[INDEXK(C)].value_.i;
emit_bitwise_shiftl(def, ra, B, -y);
} else {
// RHS is not a constant
llvm::Value *rc = emit_gep_register_or_constant(def, C);
llvm::Value *rb = emit_gep_register_or_constant(def, B);
// Since the Lua OP_SHL and OP_SHR bytecodes
// could invoke metamethods we need to set
// 'savedpc'
switch (op) {
case OP_SHL:
if (!traced) emit_update_savedpc(def, pc);
case OP_RAVI_SHL_II:
CreateCall4(def->builder, def->raviV_op_shlF, def->L, ra, rb, rc);
break;
case OP_SHR:
if (!traced) emit_update_savedpc(def, pc);
case OP_RAVI_SHR_II:
CreateCall4(def->builder, def->raviV_op_shrF, def->L, ra, rb, rc);
break;
default:
fprintf(stderr, "unexpected value of opcode %d\n", (int)op);
abort();
}
}
}
// Although the name is EQ this actually
// implements EQ, LE and LT - by using the supplied lua function to call.
void RaviCodeGenerator::emit_EQ(RaviFunctionDef *def, int A, int B, int C,
int j, int jA, llvm::Constant *callee,
OpCode opCode, int pc) {
// case OP_EQ: {
// TValue *rb = RKB(i);
// TValue *rc = RKC(i);
// Protect(
// if (cast_int(luaV_equalobj(L, rb, rc)) != GETARG_A(i))
// ci->u.l.savedpc++;
// else
// donextjump(ci);
// )
// } break;
emit_debug_trace(def, opCode, pc);
// Load pointer to base
emit_load_base(def);
// Get pointer to register B
llvm::Value *regB = emit_gep_register_or_constant(def, B);
// Get pointer to register C
llvm::Value *regC = emit_gep_register_or_constant(def, C);
llvm::Value *result = NULL;
switch (opCode) {
case OP_RAVI_LT_II:
case OP_RAVI_LE_II:
case OP_RAVI_EQ_II: {
llvm::Instruction *p1 = emit_load_reg_i(def, regB);
llvm::Instruction *p2 = emit_load_reg_i(def, regC);
switch (opCode) {
case OP_RAVI_EQ_II:
result = def->builder->CreateICmpEQ(p1, p2, "EQ_II_result");
break;
case OP_RAVI_LT_II:
result = def->builder->CreateICmpSLT(p1, p2, "LT_II_result");
break;
case OP_RAVI_LE_II:
result = def->builder->CreateICmpSLE(p1, p2, "LE_II_result");
break;
default:
assert(0);
}
result =
def->builder->CreateZExt(result, def->types->C_intT, "II_result_int");
} break;
case OP_RAVI_LT_FF:
case OP_RAVI_LE_FF:
case OP_RAVI_EQ_FF: {
llvm::Instruction *p1 = emit_load_reg_n(def, regB);
llvm::Instruction *p2 = emit_load_reg_n(def, regC);
switch (opCode) {
case OP_RAVI_EQ_FF:
result = def->builder->CreateFCmpOEQ(p1, p2, "EQ_FF_result");
break;
case OP_RAVI_LT_FF:
result = def->builder->CreateFCmpULT(p1, p2, "LT_FF_result");
break;
case OP_RAVI_LE_FF:
result = def->builder->CreateFCmpULE(p1, p2, "LE_FF_result");
break;
default:
assert(0);
}
result =
def->builder->CreateZExt(result, def->types->C_intT, "FF_result_int");
} break;
default:
// Call luaV_equalobj with register B and C
result = CreateCall3(def->builder, callee, def->L, regB, regC);
}
// Test if result is equal to operand A
llvm::Value *result_eq_A = def->builder->CreateICmpEQ(
result, llvm::ConstantInt::get(def->types->C_intT, A));
// If result == A then we need to execute the next statement which is a jump
llvm::BasicBlock *then_block =
llvm::BasicBlock::Create(def->jitState->context(), "if.then", def->f);
llvm::BasicBlock *else_block =
llvm::BasicBlock::Create(def->jitState->context(), "if.else");
def->builder->CreateCondBr(result_eq_A, then_block, else_block);
def->builder->SetInsertPoint(then_block);
// if (a > 0) luaF_close(L, ci->u.l.base + a - 1);
if (jA > 0) {
// jA is the A operand of the Jump instruction
// Reload pointer to base as the call to luaV_equalobj() may
// have invoked a Lua function and as a result the stack may have
// been reallocated - so the previous base pointer could be stale
emit_load_base(def);
// base + a - 1
llvm::Value *val = emit_gep_register(def, jA - 1);
// Call luaF_close
CreateCall2(def->builder, def->luaF_closeF, def->L, val);
}
// Do the jump
def->builder->CreateBr(def->jmp_targets[j].jmp1);
// Add the else block and make it current so that the next instruction flows
// here
def->f->getBasicBlockList().push_back(else_block);
def->builder->SetInsertPoint(else_block);
}
